Tang Kun, Hu Haibo, Xiong Ying, Chen Lin, Zhang Jinyang, Yuan Changzhou, Wu Mingzai
School of Materials Science and Engineering, Key Laboratory of Photoelectric Conversion Energy Materials and Devices of Anhui University, Anhui University, Hefei, 230601, P. R. China.
School of Materials Science & Engineering, Southwest University of Science & Technology, Mianyang, 621010, P. R. China.
Angew Chem Int Ed Engl. 2022 Jun 13;61(24):e202202671. doi: 10.1002/anie.202202671. Epub 2022 Apr 19.
Poor oxygen diffusion at multiphase interfaces in an air cathode suppresses the energy densities of zinc-air batteries (ZABs). Developing effective strategies to tackle the issue is of great significance for overcoming the performance bottleneck. Herein, inspired by the bionics of diving flies, a polytetrafluoroethylene layer was coated on the surfaces of Co O nanosheets (NSs) grown on carbon cloth (CC) to create a hydrophobic surface to enable the formation of more three-phase reaction interfaces and promoted oxygen diffusion, rendering the hydrophobic-Co O NSs/CC electrode a higher limiting current density (214 mA cm at 0.3 V) than that (10 mA cm ) of untreated-Co O NSs/CC electrode. Consequently, the assembled ZAB employing hydrophobic-Co O NSs/CC cathode acquired a higher power density (171 mW cm ) than that (102 mW cm ) utilizing untreated-Co O NSs/CC cathode, proving the enhanced interfacial reaction kinetics on air cathode benefiting from the hydrophobization engineering.
空气阴极中多相界面处的氧扩散不良会抑制锌空气电池（ZABs）的能量密度。开发有效的策略来解决这一问题对于克服性能瓶颈具有重要意义。在此，受潜水蝇仿生学的启发，在生长于碳布（CC）上的CoO纳米片（NSs）表面涂覆了一层聚四氟乙烯层，以创建疏水表面，从而形成更多的三相反应界面并促进氧扩散，使疏水CoO NSs/CC电极的极限电流密度（在0.3V时为214 mA cm）高于未处理的CoO NSs/CC电极（10 mA cm）。因此，采用疏水CoO NSs/CC阴极组装的ZAB比使用未处理的CoO NSs/CC阴极的ZAB获得了更高的功率密度（171 mW cm），证明了空气阴极上的界面反应动力学因疏水化工程而得到增强。
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